added 'RE: ***' title for github comments

Author: xiaohan2012

github_util.py

@@ -32,7 +32,8 @@ def make_dataframe(path):
         for t in th['tail']:
             all_messages.append(
                 (t['id'], i,
-                 '', t['body'],
+                 'RE: ' + h['title'],
+                 t['body'],
                  t['sender'], t['created_at'])
             )
     return pd.DataFrame(all_messages,

test_github_util.py

@@ -25,6 +25,10 @@ def test_make_dataframe(self):
             "Document multilabel y support for all splitters in model_selection module",
             self.df.iloc[0]['subject']
         )
+        assert_equal(
+            "RE: Document multilabel y support for all splitters in model_selection module",
+            self.df.iloc[1]['subject']
+        )
         assert_true(' '.join(["L(Documentation)", "L(Easy)",
                               "L(Need Contributor)"])
                     in self.df.iloc[0]['body'])
@@ -64,3 +68,4 @@ def test_remove_messages_post_by_certain_users(self):
             0,
             df[df['sender_id'] == 'coveralls'].shape[0]
         )
+